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| 1 /* |
| 2 ** $Id: lmem.h,v 1.40 2013/02/20 14:08:21 roberto Exp $ |
| 3 ** Interface to Memory Manager |
| 4 ** See Copyright Notice in lua.h |
| 5 */ |
| 6 |
| 7 #ifndef lmem_h |
| 8 #define lmem_h |
| 9 |
| 10 |
| 11 #include <stddef.h> |
| 12 |
| 13 #include "llimits.h" |
| 14 #include "lua.h" |
| 15 |
| 16 |
| 17 /* |
| 18 ** This macro avoids the runtime division MAX_SIZET/(e), as 'e' is |
| 19 ** always constant. |
| 20 ** The macro is somewhat complex to avoid warnings: |
| 21 ** +1 avoids warnings of "comparison has constant result"; |
| 22 ** cast to 'void' avoids warnings of "value unused". |
| 23 */ |
| 24 #define luaM_reallocv(L,b,on,n,e) \ |
| 25 (cast(void, \ |
| 26 (cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \ |
| 27 luaM_realloc_(L, (b), (on)*(e), (n)*(e))) |
| 28 |
| 29 #define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0) |
| 30 #define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0) |
| 31 #define luaM_freearray(L, b, n) luaM_reallocv(L, (b), n, 0, sizeof((b)[0])) |
| 32 |
| 33 #define luaM_malloc(L,s) luaM_realloc_(L, NULL, 0, (s)) |
| 34 #define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t))) |
| 35 #define luaM_newvector(L,n,t) \ |
| 36 cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t))) |
| 37 |
| 38 #define luaM_newobject(L,tag,s) luaM_realloc_(L, NULL, tag, (s)) |
| 39 |
| 40 #define luaM_growvector(L,v,nelems,size,t,limit,e) \ |
| 41 if ((nelems)+1 > (size)) \ |
| 42 ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e))) |
| 43 |
| 44 #define luaM_reallocvector(L, v,oldn,n,t) \ |
| 45 ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t)))) |
| 46 |
| 47 LUAI_FUNC l_noret luaM_toobig (lua_State *L); |
| 48 |
| 49 /* not to be called directly */ |
| 50 LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize, |
| 51 size_t size); |
| 52 LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size, |
| 53 size_t size_elem, int limit, |
| 54 const char *what); |
| 55 |
| 56 #endif |
| 57 |
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